ET HUNTING Suspicious Non-Escaping backslash in User-Agent Inbound

SID: 2010722Rev: 100 views
History
Sourceet/open
CreatedJuly 30, 2010
UpdatedMarch 7, 2024
Classificationbad-unknown
alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Suspicious Non-Escaping backslash in User-Agent Inbound"; flow:established,to_server; http.user_agent; content:"|5c|"; fast_pattern; depth:200; pcre:"/^.*[^\x5c]\x5c[^\x5c\x3d\x2f\x3b\x28\x29]/"; content:!"|5c|Citrix|5c|ICA Client|5c|"; nocase; reference:url,www.w3.org/Protocols/rfc2616/rfc2616-sec14.html; reference:url,mws.amazon.com/docs/devGuide/UserAgent.html; classtype:bad-unknown; sid:2010722; rev:10; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_07;)

References

urlwww.w3.org/Protocols/rfc2616/rfc2616-sec14.html
urlmws.amazon.com/docs/devGuide/UserAgent.html

Metadata

created at2010_07_30
confidenceMedium
signature severityInformational
tagDescription_Generated_By_Proofpoint_Nexus
updated at2024_03_07

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